Chevrolet Suburban 2007 Owner's Manual page 190

To utilize the cargo management system as a
table feature, squeeze the release lever and pull
the system towards you until the locator pin
reaches the next hole. The system will extend out
of the vehicle. The liftgate cannot be closed in
this position. Do not operate the vehicle with
liftgate open.
The cargo management system can be removed
from the vehicle. This procedure should be
completed by two people. While squeezing the
release lever, pull the system back until the rollers
clear the guides. To reinstall the system, align
the rollers to the guides, squeeze the release lever
and push into position.
On one side of the system is a retractable
storage area.
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To access, pull the handle in the center of the
system up.